Mission critical
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The term mission critical (or mission-critical) refers to any factor (equipment, process, procedure, software, etc.) which is crucial to the successful completion of an entire project. It may also refer to a project the success of which is vital to the mission of the organization which attempts it.
As a rule in the crisis management, should a triage-type decision be made in which certain components must be eliminated or delayed, e.g. because of resource or personnel constraints, the mission-critical ones must not be among them.
Marketing expert David Meerman Scott [1] states that the phrase "mission critical" is among the most overused marketing cliches, along with "next generation", "cutting edge", "industry standard", "market leading", "turnkey", etc.[1] [2]